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      Lateralization of Cognitive Functions in Aphasia after Right Brain Damage

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          Abstract

          Purpose

          The lateralization of cognitive functions in crossed aphasia in dextrals (CAD) has been explored and compared mainly with cases of aphasia with left hemisphere damage. However, comparing the neuropsychological aspects of CAD and aphasia after right brain damage in left-handers (ARL) could potentially provide more insights into the effect of a shift in the laterality of handedness or language on other cognitive organization. Thus, this case study compared two cases of CAD and one case of ARL.

          Materials and Methods

          The following neuropsychological measures were obtained from three aphasic patients with right brain damage (two cases of CAD and one case of ARL); language, oral and limb praxis, and nonverbal cognitive functions (visuospatial neglect and visuospatial construction).

          Results

          All three patients showed impaired visuoconstructional abilities, whereas each patient showed a different level of performances for oral and limb praxis, and visuospatial neglect.

          Conclusion

          Based on the analysis of these three aphasic patients' performances, we highlighted the lateralization of language, handedness, oral and limb praxis, visuospatial neglect and visuospatial constructive ability in aphasic patients with right brain damage.

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          Most cited references41

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          Development of a behavioral test of visuospatial neglect.

          The Rivermead Behavioral Inattention Test (RBIT), consisting of nine items sampling activities of daily living, was administered to 28 patients after unilateral right (20) or left (8) cerebrovascular accidents, and to 14 non-brain-damaged controls. All patients were tested on two parallel forms of the RBIT with order of presentation balanced and on at least two of six conventional tests of visual neglect. Control subjects were tested on either form 1 or form 2 of the RBIT. Interrater reliability of scoring was tested on seven subjects chosen at random. Using control scores to determine the cutoff point between visual inattention and noninattention, 14 patients (50%) showed evidence of visuospatial neglect on the RBIT. Correlation between the two forms of the test was 0.83. The RBIT also correlated well with five of the conventional tests. Interrater reliability was 100%. The RBIT appears to be a valid and reliable test of visuospatial neglect and one which is likely to provide more information about everyday problems than existing measures of neglect.
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            Gehirnpathologie

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              Cognitive processing of drawing abilities.

              This critical review examines constructional apraxia from a cognitive neuropsychological perspective. To our knowledge, van Sommers (1989) is the only researcher to present a global cognitive model of drawing abilities. He organizes it into two hierarchical systems: Marr's model of visual perception and a graphic production system. The latter comprises four hierarchically organized components: depiction decisions, production strategy, contingent planning, and articulatory and economic constraints. Van Sommers' model will be discussed in light of other models and on the basis of empirical neuropsychological studies (Farah, 1984; Kosslyn & Koenig, 1992; Roncato, Sartori, Masterson, & Rumiati, 1987; van Sommers, 1989). We find that: (1) the Kosslyn and Koenig visual perception model describes more accurately the perceptual components underlying copying than the visual perception system of van Sommers' drawing model, (2) Van Sommers' arguments in favor of a depiction processing as opposed to visual imagery are not convincing, (3) Van Sommers' assumption that a production strategy is a component is unclear, and (4) articulatory and economic constraints are not cognitive components, but constraints imposed during action programming. This literature review leads to a discussion of future research topics and the specificity of constructional apraxia. Copyright 1999 Academic Press.
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                Author and article information

                Journal
                Yonsei Med J
                Yonsei Med. J
                YMJ
                Yonsei Medical Journal
                Yonsei University College of Medicine
                0513-5796
                1976-2437
                01 May 2012
                28 March 2012
                : 53
                : 3
                : 486-494
                Affiliations
                [1 ]Department of Speech Pathology, Daegu University, Gyeongsan, Korea.
                [2 ]The Geriatric Health Clinic and Research Institute (GHCRI), Korea University, Seoul, Korea.
                [3 ]Department of Physical Medicine and Rehabilitation, Korea University College of Medicine, Seoul, Korea.
                [4 ]Department of English Language, Interpretation & Translation, Dongguk University, Seoul, Korea.
                [5 ]Department of Communication Disorders, Ewha Womans University, Seoul, Korea.
                Author notes
                Corresponding author: Dr. Sung-Bom Pyun, Department of Physical Medicine and Rehabilitation, Korea University Anam Hospital, Korea University College of Medicine, 73 Inchon-ro, Seongbuk-gu, Seoul 136-705, Korea. Tel: 82-2-920-6480, Fax: 82-2-929-9951, rmpyun@ 123456korea.ac.kr
                Article
                10.3349/ymj.2012.53.3.486
                3343425
                22476990
                7c81f7e6-8696-4aba-b37c-3c94da228c02
                © Copyright: Yonsei University College of Medicine 2012

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 30 March 2011
                : 01 September 2011
                : 07 September 2011
                Categories
                Original Article
                Neurology & Neurosciences

                Medicine
                handedness,crossed aphasia,language,oral and limb praxis,visuospatial functions,laterality
                Medicine
                handedness, crossed aphasia, language, oral and limb praxis, visuospatial functions, laterality

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